The interaction between an agent, a host, and the environment is called:
a. natural history of disease.
b. risk.
c. web of causality.
d. the epidemiologic triangle.
ANS: D
The epidemiologic triangle consists of the interaction between an agent, a host, and the environ-ment. The natural history of disease is the course of the disease process from onset to resolution. Risk is the probability an event will occur within a specified period of time. The web of causality reflects the more complex interrelationship among the numerous factors interacting, sometimes in subtle ways, to increase (or decrease) risk of disease.
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